Hello,
I’ve just got two Quectel EC25-E modules, both having firmware EC25EFAR08A07M4G
The AT+QADBKEY? command returns ERROR on both.
How do I enable ADB on these modems and get shell access?
Thank you!
Sometimes the module may return ERROR if the AT interface is not fully initialized.
Try restarting the modem with:
AT+CFUN=1,1
Wait for USB re-enumeration, then send a basic AT to confirm sync, and retry:
AT
ATI
AT+QADBKEY?
sometimes my module also responds with “ERROR” you can try using the lowercase command:
at+qadbkey?
but don’t ask me why (theoretically it should work regardless of whether it’s uppercase or lowercase) 
Unfortunately, both uppercase and lowercase commands return error, and restarting the module also doesn’t work. I suspect that the ADB activation mechanism has been changed/removed from the firmware version that I have.
@Niki.Liu-Q could you please take a look when you have time? By the way, 恭喜发财 !
1 Like
Dear @madprogrammer ,
Thank you for reaching out.
After looking through your issue, this might be a firmware build/configuration issue on the specific units. To help us verify and proceed, could you please provide:
- Firmware version (AT+QGMR)
- IMEI number (AT+CGSN or AT+GSN)
Once we have these, we’ll check the exact build details and advise the next steps.
Best Regards,
Aghelan
Hello,
Module 1:
EC25EFAR08A07M4G_A0.302.A0.302
IMEI 866358071691294
Module 2:
EC25EFAR08A07M4G_A0.302.A0.302
IMEI 866358071715515